Invalid bed



vApril 3, 1951 o. A. LOGAN 2,547,827

INVALID BED Y Filed Dec. 1, 1945 s sheets-sheet 1 Hyg/M April 3, 1951 o, A LQGAN 2,547,827

INVALID BED Filed D60. 1, 1945 3 Sheets-Sheet 2 Ey. 4 z? m 4 JNVENTOR, 0//5 A. W5/7.

April 3, 1951 Q. A. LQGAN 2,547,827

INVALID BED Filed Deo. l, 1945 l 3 Sheets-Sheet 3 INVENTOR,

v Patented Apr. 3, 1951 UNITED STATES PATENT OFFICE 4INVALID BED .ons A. Logan, Kansas city, M0. Application .December 1, 1945, Serial No. 632,207

-2 Claims.

This invention `relates to improvements Viin 4in-` valid and'hcspital beds.

y The principal object of the present invention is to provide a hospital bed with a mattress having a central cross section that is vertically adjustable and universally tiltable for adjustment relative to the body sections of the mattress.

Another object "of 'the invention is to provide a hospital bed havingY a' mattress Vwiithja central section that is mechanically movable to facilitate Vthe positioning of 1a bedpan beneath :the patient with :a minimum lef vincoimfenien'ce to the Patient. A 1

' A furtherfobect istheprovisi'on of a mattress for an invalid 'bed hav-ing a central transverse section that is mechanically `operable fur universal adjustment relative to the #main tbodyl portions ofthe mattress. Y

Another object of this invention 'is the provision -oi an 'invalid bed Vhaving a manually opere ablefcentral mattress section provided-with means whereby it vis operable by the patient positimed on the mattress. f f

Other objects are simplicity and-rigidity .of construction, ease and accuracy `of foperation, andy adaptability for .usewith the various types of invalid beds 'having tilting .mattress sections.

With these objects in view as well as other objects which will appear during the course of the specication, reference will be had to the drawings wherein: I

Figure 1 is a side elevation of aninvalid bed embodying'this invention.

Fig. 2 is an end elevation of the bed. c

Fig. `3 is an enlarged fragmentarylvseetional 'view takenon line III-III of Fig. 1. Y

...Fig 4 .is .an enlarged sectional view taken on'v line IV--IV of Fig. 1 with Vsome of the parts shown in elevation.

conventional form. Resilient elements or mat. tresses 28 and'30 having supporting frame 29 disposed respectively .adjacent the head and foot of the'bed are 'hinged at their inner ends `at 32 and 34 to the side rails 26 for tilting lengthwise of the bed. Theouter ends are provided with any of the usual means for raising and lowering, not shown. p A transverse centrally disposed resilient mattress section 36 positioned between mattress sections 26 and 3g extends entirely across the bed and is carried for vertical adjustment by side rails 26 .as hereinafter described.

A'housing 38 comprising side walls '46 :an

" end walls 42 which are secured to the side rails 26 extends downwardly from the `side rails `and serves as supports for 4means for raising and lowering .mattress 3.6..

A :rectangular frame 44 vserving to vsupport -a rectangular frame 46 having springs 48 for supporting mattress section 36 is carried cn the upper ends of lazy-tong bars 50 .and 52 which are connected for free movement to .frame 44 by pivotally mounted links 54 engaging with lugs 5,6 integral with the frame. v j

The lower ends of -bars 50 and 452 'are respectively pivotally connected with nuts 58 operatively mounted von threaded sleeves 60 and 62 which are ixed .to operating .shaft -64,.rotatably mounted in bearings 66 fixed to end walls 42 of housing 38. The threads 68 of sleeve 6.0 arev right-hand and the threads Ill -of .sleeve .62 are left-hand, so that as the shaft is rotated the nuts. `5.8 will be moved in iopposite directions to i Qperate the lazy-tongs. l

The .bars 150 and 152 are pivoted intermediate .their Y.ends to a rod, 12 which extends through guide slots i4 formed 'through side walls 4D of housing 33 whereby the lazy-tongs 5D and 52 l at -opposte sides of frame 44 are guided. Re-

Fig. '5 is a fragmentary sectional View 'taken .on line 'V-V of Figf4 with parts show-n in -e'levation. y

. YFigli is .a view similar to shown in Fig. 4 with 'the central mattressA section 36 lowered a distance below the end mattress sections.v

Fig. 7 is a horizontal sectional view taken on ig. :8 is Va sectionalview takenon .line VIII- VIII of Fig. 4. l l

Fig. 9 is a sectional section'of lazy-tongv frame and central mattress section frame showing the relative tilting of the parts.

. Throughout the several views like reference characters refer to similar parts and the nue meral 20 designates a bed frame having head member 22, foot member 24 and side rails 26 of ierring to Fig.' 7 it will be noted the nuts 58 each have projecting .arms 86 with end trunnions .8,2 for respeetivsly receiving .the ends of bars 5B, and `52.; Yfurthermcre, a pair of .guide rods 6.4 supported at their ends in end walls 42 and disposed in parallel relation with shaft 64, pass through holes 86 formed through arms 80 whereby the lazy-tongs are .secured against rotation "about shaft '64. At both sides of housing 2 8 the ends ofshaft 64 extend through Walls 42 and are provided with iixed ratchet wheels 88 which serve as collars to preclude longitudinal movement of the shaft in the frame and also serve to facilitate ratcheting of the shaft as hereinafter described.

The lazy-tong structures just described for suppositions relative to the head and food mattress sections 28 and 30 is so constructed that it will always maintain the supported mattress against accidental movement. This is apparent because the weight applied to the mattress willnot transmit any force to the nuts 58 that would tend to rotate operating shaft 64. Means for operating shaft 64 are shown and include three different structures that might be used. It will be noted that operating shaft 64 is provided at each of its opposite ends with squared sections 90 which project beyond the ratchet wheels 88. The simplest means for raising and lowering the movable section of the bed is the crank 92 which may be adjusted on either of the square ends 90 of the shaft whereby to rotate operating shaft 64 manually to adjust the height of the movablesection. When the crank 92 is not needed it may be removed and positioned out of the way.

A ratcheting means best shown in Figures 4 and 8 is provided so that one lying on the bed may grasp and oscillate a lever 94 to cause a ratcheting movementof the operating shaft in either direction. Lever 94 is provided with a round opening 96 for rotation on the squared end 90 or operating shaft 64 and carries a Y-shaped pawl member 98 by means of pivot |00.

Referring to Figure 8 it will be noted that the Y pawl member 98 is inverted with the upper end thereof pivoted at to'a rod |02 which passes through a transverse lug |04 integral with lever 94. When the pawl and rod are in the position shown in Figure 8 the engaging tooth 06 of said pawl will operatively engage the teeth of ratchet wheel 88 so that by simply oscillating lever 94 the operating shaft may be rotated in one direction. During the idle stroke of thelever the engaging point tooth will ratchet over the ratchet teeth of wheel 88 due to the force exerted by spring |08 mounted on rod |02 between lug |04 and the pivotal head of the pawl member. It is quit-e lapparent that the operator may flip the upper end of rod |02 beyond the center whereby the engaging tooth V| I0 of pawl 98 will be lowered to engage the teeth of ratchet whee1 88. The operator may then be able to rotate the operating shaft 64 in the opposite direction. This ratchet mechanism may be easily removed or positioned on shaft 64.

A power means for raising and lowering the bed section comprisesa motor ||2 driving a belt Wheel I4 which is operatively connected through belt I6 with a belt wheel I8 rigidly attached to operating shaft 64. Since it is necessary to both raise and lower the movable section it would be necessary to provide a motor of the reversible type.

Referring to the rectangular frames 44 and 46 best shown in Figures 3 and 4 it will be noted that both are made of angled iron and that the upper frame 46 normally telescopes with the lower frame 44 and rests thereon to carry the mattress 36. It is one of the principal` features of this invention to provide limited universal adjustment of the mattress carrying frame 46 relative to the frame 44 which is carried by the lazy-tongs. An adjusting screw |20 is operatively mounted in a threaded nut section |22 adjacent each corner of 4 frame 44 with its end resting against the underside of frame 46. As the screw is turned upwardly in the nut it will raise the mattress carrying frame to tilt the mattress relative to the head and foot mattress. Any single adjusting screw |20 may beoperated to tilt any particular corner o! the mattress or two or more of the screws may be adjusted to obtain tilting of the mattress at various angles. While only relatively slight tiltings may be obtained by the structure shown, however, these adjustments are intended primarily to add to the comfort of the patient due to change in position or parts of the body to relieve fatigue and to stimulate circulation. For convenience of operating screws |20 it will be noted that windows |24 have been cut in the end walls 42 of housing 38.

From the above description it is quite evident that the present transverse mattress section 36 may be positioned vertically or tilted in any desired direction to conform to the foot and head mattresses 30 and 28 as they are adjusted on their hinges for the positioning of the patient. Furthermore, by the manipulation of this center mattress section, the bed pan may be easily positioned and removed without the usual discomf fort to the patient.

What I claim as new and desire to protect by Letters Patent is: Y'

1. A hospital bed having a pair of lazy-tongs operatively carried by said bed, a central transverse framecarried by said lazy-tongs for vertical adjustment, a mattress carrying spring frame carried by said transverse frame, and adjusting screws carried by said transverse frame operable to engage and tilt said spring frame relative to said transverse frame.

2. A hospital bed having a bed frame, a pair 01: lazy-tongs -operatively carried by said bed frame, a central transverse frame carried by said lazy-V tongs, a mattress carrying spring frame carried by said transverse frame, a rotatably mounted shaft carried by said bed frame operable to cause said lazy-tongs-to raise and lowerfwhereby said spring frame is vertically adjusted, and manually operable adjusting screws carried by said transverse frame and operable to tilt said spring frame relative to said transverse frame.

u oTIs A. LOGAN. .Q

REFERENCES CITED The following references are of record in the 'lle of this patent:

UNITED STATES PATENTS Germany Jan. 9,1936 

